How to implement "search" on a custom page?

[veenuisthebest]

alright.. I have edited it now.. plz see it

So, here's my form now !

<!-- Modified Website Search Layout -->

<form action="search.php" method="post" name="linksearch">
<input type="hidden" name="s" value="$session[sessionhash]" />
<input type="hidden" name="do" value="process" />
<input type="hidden" name="titleonly" value="1" />
<input type="hidden" name="showposts" value="0">
<input type="hidden" name="sortby" value="lastpost">
<input type="hidden" name="order" value="descending">
<input type="hidden" name="s" value="">
<input type="hidden" name="forumchoice[]" value="12">
<input type="hidden" name="forumchoice[]" value="13">
<input type="hidden" name="page" value="$pagenumber" />
<input type="hidden" name="pp" value="$perpage" />
<input type="hidden" name="securitytoken" value="$bbuserinfo[securitytoken]" />

<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<tr>
	<td class="thead"><phrase 1="$limitlower" 2="$limitupper" 3="$totalthreads">$vbphrase[showing_threads_x_to_y_of_z]</phrase></td>
</tr>
 <tr valign="top">
	<td class="alt1">
		<table cellpadding="3" cellspacing="0" border="0" align="center">
		<tr>
			<td><select name="category" id="category">
<option value="0">Category</option>
					<option value="1">Arts and Literature</option>
					<option value="2">Blogs and Personal</option>
				</select></td>
			<td><select name="order" id="sel_order">
					<option value="asc" $order[asc]>Ascending</option>
					<option value="desc" $order[desc]>Descending</option>
				</select></td>
			<td class="smallfont" align="$stylevar[right]" style="padding-top:$stylevar[cellpadding]px">
				<input type="submit" class="button" value="Show Websites" />
			</td>
</tr>
		</table>	
	</td>
  </tr>
</table>
</form>
<!-- /Modified Website Search Layout -->

Now, what to do next ? How would search.php would make a search in my custom table ?
Thanks